Is it possible to draw a control across C++ WinRT component to HTML5?

Question

We know we can draw something in a web page through plugin which is designed by c++. Now I have a Js project and invoke a C++ WinRT component. Can I draw something in a page through c++ code rather than js code? Thanks!

Answer 1

You cannot draw directly on an HTML page from C++. You could generate a bitmap from C++ and then pass that to JS code to draw it on the page.

--Rob

Answer 2

Thanks Rob!

So you mean I only draw something in JS. I also have question as below:

 How about using directX? Can it work?

Answer 3

You cannot draw directly on your HTML page from C++.

You could use DirectX to render a bitmap and then pass that to your JavaScript code to draw it on the page.

You would need to add your controls from JavaScript.

--Rob

Answer 4

OK, got it.

I have a win32 JS project and I can install a plugin which was used ATL to draw something on a page. Now I want to port it to new windows 8 style . I'v noticed ATL is not fully supported in windows 8. How can I do ?

Answer 5

Hi Rob, do you know any samples similar with this situation?

OR when I press on a page, the c++ component can listen this event and then draw a bitmap with background task?

Thanks!

Answer 6

You will likely need to rewrite your drawing code using Direct2D. It is likely your existing ATL code uses unsupported drawing technologies (GDI, GDI+, etc.) Depending on what exactly it does you may be able to keep the logic, but the details likely need to change.

See Creating Windows Runtime Components in C++ for information on how to write a Windows Runtime Component. I'm not aware of any samples which specifically return bitmap data.

--Rob